package com.mmall.common;

import org.codehaus.jackson.annotate.JsonIgnore;
import org.codehaus.jackson.map.annotate.JsonSerialize;

import java.io.Serializable;

//除去下面三个变量其中一个为空时不用返回，eg:data=null时不显示data
//就是为了序列化json的时候，如果是null的对象，key也会消失
@JsonSerialize(include = JsonSerialize.Inclusion.NON_NULL)
public class ServerResponse<T> implements Serializable {
    private int status;
    private String msg;
    private T data;//方便后面返回的数据可以有多种数据类型

    private ServerResponse(int status){
        this.status = status;
    }
    private ServerResponse(int status, T data){
        this.status = status;
        this.data = data;
    }
    private ServerResponse(int status, String msg, T data){
        this.status = status;
        this.msg = msg;
        this.data = data;
    }
    private ServerResponse(int status, String msg){
        this.status = status;
        this.msg = msg;
    }
    //加jsonIgnore处理这个方法不让它在序列化之后的json中显示
    @JsonIgnore
    public boolean isSuccess(){
        return  this.status == ResponseCode.SUCCESS.getCode();
    }

    public int getStatus(){
        return status;
    }
    public T getData(){
        return  data;
    }
    public String getMsg(){
        return msg;
    }

    public static <T> ServerResponse<T> createBySuccess(){
        return  new ServerResponse<T>(ResponseCode.SUCCESS.getCode());
    }

    public static <T> ServerResponse<T> createBySuccessMessage(String msg){
        return new ServerResponse<T>(ResponseCode.SUCCESS.getCode(),msg);
    }

    /*
        下面两个函数就解决了当data是String类型的时候调用哪个构造器（参数的不同）
     */
    public static <T> ServerResponse<T> createBySuccess(T data){
        return  new ServerResponse<T>(ResponseCode.SUCCESS.getCode(),data);
    }

    public static <T> ServerResponse<T> createBySuccess(String msg,T data){
        return  new ServerResponse<T>(ResponseCode.SUCCESS.getCode(),msg,data);
    }

    //创建失败的方法
    public static <T> ServerResponse<T> createByError(){
        return new ServerResponse<T>(ResponseCode.ERROR.getCode(),ResponseCode.ERROR.getDesc());
    }
    //创建失败返回失败的信息内容
    public static <T> ServerResponse<T> createByErrorMessage(String errorMessage){
        return  new ServerResponse<T>(ResponseCode.ERROR.getCode(),errorMessage);
    }

    public static <T> ServerResponse<T> createByErrorCodeMessage(int errorCode,String errorMessage){
        return  new ServerResponse<T>(errorCode,errorMessage);
    }

}
